《电路与电子技术》（双语）试卷2013(1)a答案

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1、华南理工大学期末考试A1.ConsiderthecircuitshowninFig.1giventhatUS1=6V,US2=10V,R1=4W,R2=2W,R3=4W,R4=1W,R5=10W.FindthevalueofI1,I2,I3,I4,I5andVAB.（6scores）Fig.12.ConsiderthecircuitshowninFig.2,thetwoidealdiodesareofthesametype,vi=6sinwtV,pleasejudgethestateofD1andD2(onoroff)andplotthewaveformof

2、voltagevO.（6scores）Fig.23．ConsiderthecircuitshowninFig.3giventhatUS=1V,IS=1A,R1=R2=R3=1W.DeterminecurrentI1,I2andvoltageUinsuperposition,whichelementsaresupplyingpower?（8scores）Fig.384．FindtheTheveninequivalentcircuitsforthetwo-terminalcircuitshowninFig.4giventhatR1=R2=2kW,R3=0.4kW

3、.（10scores）Fig.45.ConsiderthecircuitshowninFig.5givenIS=9mA,R1=6kW,R2=3kW,C=2mF.TheswitchShasbeenopenforalongtime,andthenclosedatt=0,pleasefindtheafterSisclosed.(10scores)Fig.56.ConsiderthesinusoidalcircuitshowninFig.6giventhatR=8W,XL=6W,I1rms=I2rms=0.2A.FindthevalueofIrms,Vrms,the

4、powerfactorandreactivepowerofthetotalcircuit.（10scores）Fig.687.Abalancedpositive-sequencewyethree-phasesourcehasline-to-linevoltagesof380Vrms.thissourceisconnectedtoabalancedwye-connectedloadinFig.7.EachphaseoftheloadisZ=3-j4W.FindtheinstantaneouscurrentofiaA,ibB,icC,iNn,theapparen

5、tpower,averagepowerandthereactivepowerdeliveredtotheload.AssumethatthephaseofVabiszero.（10scores）Fig.78.ConsiderthecircuitshowninFig.8giventhatR1=R2=R3=10kΩ,RF=20kΩ,uI1=1V,uI2=2V,uI3=-1V,.FindthevalueofoutputvoltageuO.（10scores）Fig.89.TransistorsareoperatingintheactiveregioninFig.9

6、,assumethat:β=50,rπ=1kΩ,determine：（1）plotsmallsignalequivalentcircuit；（2）calculateinputresistorriandoutputresistorro；（3）voltagegainAu.(12scores).8Fig.910.ConsiderthesourcefollowerillustratedinFigure10,determine:(1)plotsmallsignalequivalentcircuit;(2)Computethevoltagegain,inputresis

7、tance,andoutputresistance.(10scores)fig.1011.ConsiderthecircuitshowninFig.11,writethelogicformulaandmakesimplificationinDeMorgan’slaw,analyzeitslogicfunction.(8scores)81.I1=I2==1A2I3=I4==2A4I5=0A5VAB=0V62.1.Whenvi>=3V,D1on,D2off,vo=3V2.Whenvi<=-3V,D1off,D2on,vo=-3V2.When-3

8、1off,D2off,vo=vi3．ISactsal